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SCCM Windows Updates Fault due to WPAD File

Posted on 2011-02-11
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Last Modified: 2013-11-21
I have setup and ran for many months SCCM R2. We use this for Windows updates, future software rollouts and general hardware/software reporting.
Recently with the addition of a new Hardware Based Web Filtering system a WPAD setting has had to be put in place for our non domain clients to redirect them through the new filtering system.
This has somehow had a negative effect on my domain clients scanning for windows updates and reporting back to the SCCM Server. When I run the “Troubleshooting 3 - Computers failing with a specific scan error“ report all domain clients report back as Scan failed with an error code of -2145107941. Needless to say my compliance reports come back as unknown.
If we remove/disable the WPAD then all domain clients scan without fault. I can then update all clients. We tested this a few times to be sure.
The WPAD file has to stay to accommodate the non domain clients.
Does anyone have an idea how I can get round this issue? I don’t want to move away from SCCM windows updating as it’s worked flawlessly until now.
Thank you
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Question by:WycombeAbbey
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rscottvan earned 500 total points
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In my experience this happens because the hardware filter (proxy server) requires authentication, and Windows Update doesn't authenticate when connecting to Microsoft.

You should be able to configure the filter with a Whitelist or rule for Microsoft updates, not to require authentication when hitting those specific websites.

What kind of filter is it?
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by:WycombeAbbey
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Hello Rscottvan. Apologies for my late reply.

We have installed the Bloxx Hardware web filtering solution. The SCCM clients don't go to Microsoft for windows updates as the SCCM and WSUS server handles the updates distribution internaly.

From what I have read the SCCM Clients do not like proxy servers and cannot deal with authentication as it’s supposed to be a straight through communication from client to server. However with this WPAD file all communication is being routed through Bloxx first.

Thank you for the idea of a whitelist. I must admit I didn't think of this.

I will include the IP an NetBios names (if possible) of the WSUS and SCCM servers together with the http address of the WSUS to the white list and see what happens.

I will post again with my results.
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by:WycombeAbbey
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Thank you very much. The idea about the whitelist helped me greatly. I can't think why I didn't think about this. Basicly I have added the IP , netbios name and FQDN of the SCCM server to our filtering system whitelist. This allowed all clients to communicate to the SCCM Server bypassing the filtering systems authentication process.
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